diff --git a/src/firejail/seccomp.c b/src/firejail/seccomp.c
index 8314a6bc9..7cbd79d6b 100644
--- a/src/firejail/seccomp.c
+++ b/src/firejail/seccomp.c
@@ -41,7 +41,7 @@ char *seccomp_check_list(const char *str) {
 	const char *ptr1 = str;
 	char *ptr2 = rv;
 	while (*ptr1 != '\0') {
-		if (isalnum(*ptr1) || *ptr1 == '_' || *ptr1 == ',' || *ptr1 == ':' || *ptr1 == '@')
+		if (isalnum(*ptr1) || *ptr1 == '_' || *ptr1 == ',' || *ptr1 == ':' || *ptr1 == '@' || *ptr1 == '-')
 			*ptr2++ = *ptr1++;
 		else {
 			fprintf(stderr, "Error: invalid syscall list\n");